1 We keep in touch with the people in the world by means of radio and TV.
2 We must make up for the lost time.
3 The floor is so dirty that it needs cleaning.
4 He was sent to town to find out the situation.
5 An old woman was knocked down when she was crossing the street.
6 The Great Wall was regarded as one of the wonders of the world.
7 Were you watching TV at this time yesterday?
8 Do you mind my watching the TV series?
9 Tom pretended to do his homework when his mother came in.
10 You can go out as long as you promise toi come back before 11 o'clock.